I'm getting the metadata and PDF from the example URL without any error. See https://www.zotero.org/support/troubleshooting_translator_issues for a full list of possible tests, but I would recommend step 13 in particular since Arxiv is clearly an important platform that Zotero supports well in general.
See https://www.zotero.org/support/troubleshooting_translator_issues for a full list of possible tests, but I would recommend step 13 in particular since Arxiv is clearly an important platform that Zotero supports well in general.